/*
  SOLID - Interference Detection Library
  Copyright (C) 1997 Gino van den Bergen

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Library General Public
  License as published by the Free Software Foundation; either
  version 2 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Library General Public License for more details.

  You should have received a copy of the GNU Library General Public
  License along with this library; if not, write to the Free
  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

  Please send remarks, questions and bug reports to gino@win.tue.nl,
  or write to:
                  Gino van den Bergen
		  Department of Mathematics and Computing Science
		  Eindhoven University of Technology
		  P.O. Box 513, 5600 MB Eindhoven, The Netherlands
*/

#ifndef _PLANE_H_
#define _PLANE_H_

#include <3D/Vector.h>
#include <3D/Point.h>
#include "Transform.h"

class Plane {
public:
  Plane() {}
  Plane(Scalar a, Scalar b, Scalar c, Scalar d) { setValue(a, b, c, d); }
  Plane(const Vector& v, const Point& p) { setValue(v, p); }
  Plane(const Plane& x, const Transform& t) { setValue(x, t); } 
  
  Scalar operator()(const Point& p) const { return dot(p, norm) - dist; }
  
  const Vector& normal() const { return norm; }
  Scalar        distance() const { return dist; }
  
  void setValue(Scalar a, Scalar b, Scalar c, Scalar d) {
    norm.setValue(a, b, c);
    dist = d;
  }

  void setValue(const Vector& v, const Point& p) {
    norm = v.normalized();
    dist = dot(p, norm);
  }
  
  void setValue(const Plane& x, const Transform& t) {
    norm = t(x.norm);
    dist = x.dist + dot(t.getPosition(), norm); 
  }

private:
  Vector norm;
  Scalar dist;
};
  
#endif

